Saving to PDF with high quality

I am trying to save a couple of draft files as PDF in order to show a customer. I select save as and then change it to be saved as a PDF. If I click the option button I can change a few stuff there among the dpi so I put that at the maximum. However I still get very thick blurry lines in the PDF I created when I zoom.

I tried to find a way to print as PDF under the print option but no luck there. Any suggestions for me?

Re: Saving to PDF with high quality

Another trick is to increase the scale of the draft. I usually use A3 Sheet if I want to save to PDF. The larger the scale, the better the quality and the customer doesn't have to use the neat CTRL+5-trick suggested by Bshand.